The pipe to the house and inside the house has to be much larger to make them work. They are also noisier which can be objectionable in a house at 3:00 a.m.

: While I'm happy with my Toto Ultramax at home, at work they have a new water saving Kohler tankless toilet that is in a different league flush wise than any tank toilet I've ever seen. The water main is the same as in my house, as is the pressure. Why aren't these more popular? Thanks.